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From "Matt Tucker" <m...@jivesoftware.com>
Subject RE: javac -O ?
Date Wed, 28 Nov 2001 22:06:53 GMT
Winton,

I'm not sure that javac -O actually does anything. From the 1.3 tool
documentation: 

"Note: the -O option does nothing in the current implementation of javac
and oldjavac."

In fact, the JDK 1.4 tool documentation doesn't even mention the -O
option (even though "javac -help" still lists the option).

In regards to your earlier email about JVM optimization -- you may want
to check out the Jrockit JVM if you have a chance. I haven't used it
yet, but the features sound interesting for server-side Java
performance. http://www.jrockit.com

Regards,
Matt

> -----Original Message-----
> From: Winton Davies [mailto:wdavies@overture.com] 
> Sent: Wednesday, November 28, 2001 4:51 PM
> To: Lucene Users List
> Subject: javac -O ?
> 
> 
> Hi,
> 
>   Is the nightly build compiled Optimized ? if not, has anyone ever 
> tried compiling Optimized, and using that ? Does it help improve 
> performance ? It would seem to me that given the compute intensive 
> nature of querying, that even slightly improved compilations would 
> speed things up ?
> 
>   Cheers,
>    Winton
> 
> Winton Davies
> Lead Engineer, Overture (NSDQ: OVER)
> 1820 Gateway Drive, Suite 360
> San Mateo, CA 94404
> work: (650) 403-2259
> cell: (650) 867-1598
> http://www.overture.com/
> 
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